Superheater for flue-boilers.



PATENTED APR. 25, 1905Y W. SCHMIDT. SUPBRHBATBR FOR PLUE BOILERS.

APPLICATION FILED NOV. 21,1904.

' 2 SHEETS-SHEET 1.

rm O 9 l 5s 2 R. \P A D E T N E T A P SUPERHEATBR POR PLUB BOILERS.

APPLICATION FILED NOV. 21,1904.

2 SHEETS-SHEET 2.

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NTTee STA-Tes Patented April 25, 1905.

PATENT @Tricia SUPERHEATER FOR FLUEBOILERS.

SPECIFICATION forming part of Letters Patent No. 788,170, dated April 25,' 1905.

Application tiled November 2l, 1904. Serial No. 233,646.

Be it known that I, YILHELM SCHMIDT, a 3

subject of the King of Prussia, German Emperor, and a resident of ll/illiclnishhe, near Cassel, in the Province of liesse-N assau, German Empire, have invented certain new and useful improvements m Mantle-Tube Superl heaters for F lue-Boilers, of which the following is an exact specification.

My invention relates to flue-boilers inl which the superheater is formed by a number of lmiler-llues and by surrounding these [luesl on part of their length by mantle-tubes, thereby creating between the mantle-tubes and their ilues annular spaces which are used for superheatiiig the steam.

rlhe main feature of the invention now consists therein that these mantle-tubes are provided with secondary eoncentrically-placed tubes, so as to insulate the steam in the tubes. 'l`he annular space within the heat-insulatii'ig double-mantle tube is provided with a stationary layer of steam, air, or water highly suitable as insulating layer. This annular space is perfectly closed, so that any movement in the interior of the insulator is practically avoided.

ln order to malte my invention more clear, l refer to the accompanying drawings, in which4 Figure 1 shows a locomotive or locomobile boiler fitted out with a superheater according to my present invention. Fig. 2 shows a side view of the superheater and boiler. Figs. 3 and t show detail views of super-heaterllues.

ln Fig. l, (l il are chambers arranged at the back wall of the flues, the chambers being separated from each other by a partition d2.

(I is the tube leading the steam to be super- I heated from the steam-denic to the ehamber d. m represents heat-insulating mantletubes surrounding the tour upper rows `r r r of the boiler-(lues. b is a chamber to the wall of which the left-hand ends of the mantle-tubes Am are tightly secured, whereas the wall lf of this chamber is lirinlyconnected to the Ilues.

ln the uppermost superheater mantle-tube of Fig. 3 a secondary tube t is concentrieally ,l placed and firmly connected to fm at both ends, so as to form between i and lm an annul lar space which may be filled with steam, air,

or water, thereby obtaining a heat-insulating I double mantle-tube m fi. In the lower arrangement of Fig. 3 the secondary tube 't is 1 concentrically placed around mantle-tube I)ny and Vfastened to the latter at both ends, l thereby creating a more or less closed heatinsulating annular space between the outside i tube i and the inner tube m.

rlhe. operation is as follows: The steam to be superheated enters, through pipeJ (t, chamber d, llows between the heat-insulating double mantle-tube yi m and the llue yr, Fig. 3, to the left, enters chamber b, passes over, as indicated by arrows, into the annular space between the double mantle-tube t 'In and [lue 7', Fig. 3, then moves to the right in the samedirection as the heating gases flowing through the flue, and enters, now superheated, the chamber d, from where the steam can be led off to its place of destination. ln Fig. 3 the steam first llows in counter-current to the heating gases through the upper tube, thereby being dried, and is then moved in equal current to the heating gases through the lower tube, thereby being supcrheated, the double tubes i m preventing the boilerwater lfrom cooling the steam to be superheated.

ln Fig. 4L, t2 is a heat-insulating layer, and fu i a conccntrical tube creating rettn'n-channels. l lilaving thus fully described the nature of my invention, what l desire to secure by Lotters Patent of the United States isW l. ln a superheater for flue-boilers, the combination with the boiler-body prol'ier, of a plurality of Ilues, some of them being concentrically surrounded by two tubes so as to form heat-insulated spaces between the 'flues and the mantle-tubes, means for leading the steam to be super-heated through the annular spaces between the [lues and the mantle-tube, for the purpose as set forth.

2. ln a super-heater for flue-boilers, the combination with the boiler-body proper, of a plurality of llues, some of them being concentrically surrounded by two tubes tightly l placed upon each other, one of both consist- IOO ing of heat-insulating material, and means l the flues and the mantletubes, so as to crefor leading steam to be superheated through l ate return-channels, and means for leading the annular space between the [lues and the l the steam to be superheated through these mantle-tubes, substantially as described and return-channels, substantially as described and for the purpose set forth.

for the purpose set forth.

3. In a superheater for flue-boilers, the ln witness whereof l have hereunto set my hand in the presence of two witnesses.

combination with the boiler-body proper, of a plurality of ilues some of them beinff cony centrically surrounded by two tubes tightly l WILHELM SCHMIDT placed upon each other7 one of both consistl ing of heat-insulating material, a partition t arranged within the annular spaces between Vitnesses:

GUsTAV HENKE, J ULIUs FRANKE. 

